<?php
/** 
 * EGP Framework
 *
 * LICENSE
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @author     Akon(番茄红了) <aultoale@gmail.com>
 * @copyright  Copyright (c) 2008 (http://www.tblog.com.cn)
 * @license    http://www.gnu.org/licenses/gpl.html     GPL 3
 */

!defined('EGP_LIB_DIR') && die('Access Deny!');

/**
 * 文本分词
 *
 * @package    classes
 * @author     Akon(番茄红了) <aultoale@gmail.com>
 * @copyright  Copyright (c) 2008 (http://www.tblog.com.cn)
 * @license    http://www.gnu.org/licenses/gpl.html     GPL 3
 */
abstract class EGP_Text_Segment
{

    /**
     * 工厂模式调用文本分词
     *
     * @param  string  $adapter
     * @param  mixed   $options
     * @return EGP_Text_Segment_Abstract
     * @throws EGP_Exception
     */
    public static function factory($adapter, $options = array())
    {
        if ($options instanceof EGP_ArrayObject)
            $options = $options->toArray();

        if (!is_array($options))
            throw new EGP_Exception('文本分词的配置参数必须是一个数组(Array)');

        $class = 'EGP_Text_Segment_' . ucfirst($adapter);
        if (!EGP_Core::classExists($class)) {
            throw new EGP_Exception("不支持的文本分词方法: '$adapter'");
        }

        $obj = new $class($options);
        if (!$obj instanceof EGP_Text_Segment_Abstract) {
            throw new EGP_Exception("'$adapter' 必须从 'EGP_Text_Segment_Abstract ' 继承");
        }

        return $obj;
    }

}